Transport via membrane

Question 1

what is passive transport (simple diffusion)

Answer 1

• The net passive movement of a substance from a region of high concentration to a region of low concentration until an equilibrium is reached.
  
  • Requires no energy input

Question 2

What is Passive transport (Facilitated diffusion)

Answer 2

• The passive net movement of a substance from a region of high concentration to a region of low concentration with the assistance of a carrier or channel protein.
• Requires no energy input.

Question 3

what is Passive transport (Osmosis):

Answer 3

• The passive net movement of free water molecules from a region of high water concentration to a region of low water concentration (low solute to high solute)

Requires no energy input

Question 4

what happens when a cell is in a hypotonic solution?

Answer 4

the extracellular solution has a lower solute concentration that that of the cells internal environment. Water will move into the cell and it will expand.

Question 5

what happens when a cell is in an isotonic solution?

Answer 5

the intracellular and extracellular environment is equal in solute concentration

Question 6

what will happen when a cell is in a hypertonic solution?

Answer 6

the extracellular solution has a higher solute concentration than the cells internal environment. Water will move out of the cell and it will shrink.

Question 7

what is active transport?

Answer 7

• The net movement of a substance from a region of low concentration to a region of high concentration (against the concentration gradient), using a protein carrier.
  
  • Energy is required in the form of ATP

Question 8

what is Active transport (bulk transport):

Answer 8

• Movement of large particles (or a large number of small particles) into or out of a cell without directly crossing the membrane using vesicles.
  Requires energy in the form
  against the concentration gradient

Question 9

what are the three steps of exocytosis?

Answer 9

1- Vesicular transport
2- Fusion
3- Release

Question 10

what are the three stages of endocytosis?

Answer 10

1- Fold
2- Trap
3- Bud